Enhanced Electron Collection and Light Harvesting of CH3NH3PbI3 Perovskite Solar Cells Using Nanopatterned Substrates

Abstract

AbstractIn this study, a CH3NH3PbI3‐based perovskite solar cell (PSC) with high power conversion efficiency (PCE) has achieved by incorporating a nanopatterned fluorine‐doped tin oxide (FTO) substrate (NPFS). This NPFS‐PSC is prepared with different structural depths (100, 150, and 200 nm) using both self‐assembly and sphere lithography techniques. As determine through the optical and electrical analysis of different PSC devices, the NPFS‐PSCs not only display the enhanced light absorption (due to the 2D diffraction grating) but also improve the electron collection efficiency by increasing the FTO/electron transport layer (ETL) and ETL/perovskite effective interface area. Compared to a planar PSC, the photocurrent density of the 200 nm etched NPFS‐PSC is enhanced from 19.27 to 23.81 mA cm−2 leading to an increase in the PCE from 14.21% to 17.85%. These results indicate that introducing the NPFS into the TiO2‐based PSC can improve both light absorption ability and electron extraction and, therefore, represents a novel, promising, high‐performance photovoltaic device.